[PATCH v2 4/4] mm/truncate: avoid pointless cleancache_invalidate_inode() calls.

[Andrey Ryabinin <aryabinin@virtuozzo.com>]

cleancache_invalidate_inode() called truncate_inode_pages_range()
and invalidate_inode_pages2_range() twice - on entry and on exit.
It's stupid and waste of time. It's enough to call it once at
exit.

Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 mm/truncate.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/mm/truncate.c b/mm/truncate.c
index 8f12b0e..83a059e 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -266,9 +266,8 @@ void truncate_inode_pages_range(struct address_space *mapping,
 	pgoff_t		index;
 	int		i;
 
-	cleancache_invalidate_inode(mapping);
 	if (mapping->nrpages == 0 && mapping->nrexceptional == 0)
-		return;
+		goto out;
 
 	/* Offsets within partial pages */
 	partial_start = lstart & (PAGE_SIZE - 1);
@@ -363,7 +362,7 @@ void truncate_inode_pages_range(struct address_space *mapping,
 	 * will be released, just zeroed, so we can bail out now.
 	 */
 	if (start >= end)
-		return;
+		goto out;
 
 	index = start;
 	for ( ; ; ) {
@@ -410,6 +409,8 @@ void truncate_inode_pages_range(struct address_space *mapping,
 		pagevec_release(&pvec);
 		index++;
 	}
+
+out:
 	cleancache_invalidate_inode(mapping);
 }
 EXPORT_SYMBOL(truncate_inode_pages_range);
@@ -623,9 +624,8 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
 	int ret2 = 0;
 	int did_range_unmap = 0;
 
-	cleancache_invalidate_inode(mapping);
 	if (mapping->nrpages == 0 && mapping->nrexceptional == 0)
-		return 0;
+		goto out;
 
 	pagevec_init(&pvec, 0);
 	index = start;
@@ -689,6 +689,8 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
 		cond_resched();
 		index++;
 	}
+
+out:
 	cleancache_invalidate_inode(mapping);
 	return ret;
 }
-- 
2.10.2